// Shared URL-key derivation for note lookups.
// Used by the side panel (load/save), the notes-list click handler
// (tab matching), and background navigation detection.

const DEFAULT_CONFIG = {
  // Default: scheme://domain/path?search, hash excluded.
  buildKey(url) {
    try {
      const u = new URL(url);
      return `${u.protocol}//${u.host}${u.pathname}${u.search}`;
    } catch {
      // If URL parsing fails, use the raw string as-is.
      return url;
    }
  },
};

let _config = { ...DEFAULT_CONFIG };

/**
 * Derive a storage key from a page URL.
 * @param {string} url
 * @param {object} [config] — optional override (for testing / future UI changes)
 * @returns {string}
 */
export function buildNoteKey(url, config = _config) {
  return config.buildKey(url);
}

/**
 * Swap the key-derivation rule at runtime.
 * @param {object} newConfig — must expose a `buildKey(url)` function
 */
export function setKeyConfig(newConfig) {
  _config = { ...newConfig };
}

/**
 * Return the current config (read-only copy).
 */
export function getKeyConfig() {
  return { ..._config };
}